As of about an hour ago, Alien Swarm, Valve’s remake of the groundbreaking Unreal Tournament 2004 mod, is available for free download on Steam. Servers currently appear to be under heavy load, but if you hang in there, you too can “blaze your way through an overrun, off-world colony, eradicating the alien infestation in environments ranging from the icy planet’s surface, to a subterranean lava-flooded mining facility.”
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Valve’s launch trailer below — but really, just download the game when you get the chance.